Introduction (problem statement and relevance). This work is devoted to the peculiarities of developing and building a general diagnostic structure for the domestic vehicles, the requirements for it and the description of the necessary diagnostic services in the process of its implementing.
The purpose of the work was to develop domestic software diagnostic system for the wheeled vehicles and their environment to meet the international standards of the Unified Diagnostic Services protocol according to ISO 14229 and could implement various diagnostic services.
Methodology and research methods. The basic requirements and specifications of the CAN bus (ISO 15765) and the UDS protocol (ISO 14229) were described. The developed system was implemented in the Python programming environment, with the algorithm, logic of the application and the directly received data were considered and sent to the CAN data bus during the reading procedure at the address.
Scientifi c novelty and results. To diagnose vehicle malfunctions the principles of testing and validating software as part of the electronic control units equipment structure of a wheeled vehicle and necessary to complete the development and implementation of the diagnostic system software in real operating conditions were suggested. The principles of carrying out software tests, as well as the documentation data and analysis of the results obtained were described, together with the formulated conclusions on the work.
Practical significance. The paper presents the diagnostic software development results and their implementation in production to meet the requirements of ISO 14229 and ISO 15765. The software is designed to improve the efficiency of the production process to detect and localize vehicle malfunctions during their maintenance work in a service center.

Introduction (statement of the problem and relevance). The problem of vehicle handling and stability during rectilinear motion was raised in the first half of the 20th century, and today this issue is still relevant. The requirements for handling, including during rectilinear movement of modern cars, are getting tougher. Straight-line stability and long-distance directional stability affect driver's fatigue, his driving safety and pleasure, as well as car fuel efficiency. Besides it, to provide modern driver assistance system, the car should possess good straight-line stability. At the same time, the design mustn't be affected by unbalanced forces and torques that could cause the trajectory deviation of the vehicle. There comes a need for an objective controllability and stability assessment of the car in a straight line.
The purpose of the research was to analyze the existing methods for studying rectilinear motion controllability, to develop objective parameters for evaluating such motion, and to apply the worked out solutions when analyzing vehicle tests results.
Methodology and research methods. Mathematical analysis, comparison, experiments, measurements were applied as research methods.
Scientific novelty and results. The results have been presented in the form of a developed straight motion evaluation parameters list and were processed by calculating objective evaluation parameters. The scientific novelty is presented by the parameters of the driver's work objective assessment, and the first step has been made to correlate the objective and subjective assessment of the test driver.
Practical significance. The developed method of the objective assessment can be applicable to all vehicles with traditional steering control.

Introduction (problem statement and relevance). This article presents the thermal calculation results of an in-line six-cylinder highly accelerated engine with a displacement of 13 liters with compression ignition, according to the controlled Miller cycle. The result of the study is the main performance indicators that testify the potential for using the controlled Miller cycle with the intake valves early closing in a highly forced engine as one of the ways to improve energy efficiency.
The purpose of the study was to evaluate the effect of valve timing and the intake and exhaust valves lift on the average specific fuel consumption of a highly forced automobile engine with compression ignition at the early stages of design.
Methodology and research methods. Computational and theoretical studies were carried out using mathematical modeling of thermodynamic processes in a one-dimensional setting. The reliability of the calculations was verified by comparing the simulation data and the results of experimental studies of the internal combustion engine. To develop the laws of valve lift, the method of sequential nonlinear quadratic programming was used.
Scientific novelty and results. The law of valve lift of a highly accelerated automobile engine with compression ignition according to the controlled Miller cycle has been developed, which made it possible to reduce the minimum specific fuel consumption by up to 7.8% in comparison with the basic version of the engine.
Practical significance. The developed thermodynamic models make it possible to evaluate the qualitative and quantitative contribution to achieving fuel efficiency through the use of the controlled Miller cycle and obtain initial data in the form of a valve lift law for further work on the development of a valve timing mechanism.

Introduction (statement of the problem and relevance). The need for vehicles motor fuels is growing from year to year. Limited oil resources lead to the need to replace them with alternative ones. The necessity to find a solution of the problem is also encouraged by the current unfavorable environmental situation. The possibility of using alternative fuel resources in existing engines requires the study of their influence on various aspects of engine operation, including the process of fuel supply and combustion in the engine cylinder.
The purpose of the current research was to obtain the characteristics of fuel supply and combustion in a diesel engine operating on methanol and methyl ester of rapeseed oil.
Methodology and research methods. As an object of study, a tractor diesel engine with a dimension of 2Ч 10.5/12.0 air-cooled with volumetric mixing was chosen. The characteristics presented in the work were taken in the nominal mode at the crankshaft speed n = 1800 rpm and the average effective pressure in the cylinder p_e = 0.588 MPa, as well as in the maximum torque mode n = 1400 rpm, p_e = 0.594 MPa. Pilot fuel supply in all modes was constant and fixed. The fuel injection advance setting angles were also constant and amounted 34° of the crankshaft rotation to the top dead center for each of the fuels.
Scientific novelty and results. The article considered the bench tests results of a diesel engine operating on methanol and rapeseed oil methyl ester in two characteristic modes. The indicators of fuel supply and combustion process in the diesel cylinder have been presented. The analysis of these indicators allowed determining the influence of the fuel supply process on the combustion characteristics in the engine.
The practical significance lies in the possibility of using the obtained results to improve the operation of diesel engines on alternative renewable fuels.

Introduction (problem statement and relevance). Road transport plays one of the key roles in the Russian Federation economy. It carries 59% of passengers and 68% of cargo. At the same time, the density of the road network in the country is only 64 km per 1000 km², of which only 70% is occupied by paved roads. The hard surface road network density of the North and North-East regions, occupying more than 60% territory of the Russian Federation, is even less. More than half of the road transport is carried out on dirt and winter roads which often become impassable for traditional cars in winter and spring-autumn time. Therefore, the task of increasing the cross-country ability of traditional wheeled vehicles arises.
The purpose of the study was to determine the main directions for increasing the cross-country ability of traditional vehicles.
Methodology and research methods. Based on domestic and foreign materials the system research analysis of the main ways to increase the cross-country ability of wheeled vehicles was made.
Scientific novelty and results. The article provides a brief analysis of the ways to improve the cross-country ability of wheeled vehicles, as well as the suggestions to increase it.
Practical significance. The article proposes the main ways to increase the cross-country ability of traditional vehicles.

Introduction (problem statement and relevance). Electric vehicles are considered environmentally friendly and contribute to solving the world's energy crisis. The Socialist Republic of Vietnam is one of the top ten countries heavily affected by climate change and ranks 15th in the world in terms of annual average fine particulate matter (PM2.5) pollution. At the 26th United Nations Climate Change Conference COP 26 in Glasgow, in 2021, because of a high level of environmental pollution the Prime Minister of Vietnam announced plans to achieve zero emissions by 2050. The achievement of zero CO₂ emissions in the country was determined as one of eight national strategies by the Vietnamese government and was to be reached with the help of electric vehicles development.
The purpose of the study was to work out recommendations for the sustainable development plan implementation of the electric transport industry in Vietnam.
Methodology and research methods. Analytical and predictive research methods were used in the article.
Scientific novelty and results. Taking into account the real needs of the people, the tasks of the government, and the potential development of electric vehicles service infrastructure, including energy and transportation systems, a roadmap for the introduction of electric vehicles in Vietnam has been developed.
Practical significance. This article allows, as a first approximation, to determine the initial steps for the electric vehicles development and implementation in the Socialist Republic of Vietnam.

Introduction (problem statement and relevance). In operating wheeled vehicles, air pollution occurs that affects human health. The emissions of non-exhaust origin particulate matter are particularly harmful. But the problem is that there does not exist a generally accepted methodology for estimating emissions caused by tire and road wear.
The purpose of the study was to review modern methods for estimating wheeled vehicles non-exhaust emissions, to analyze the problematic issues of estimating particulate emissions resulting from tire and road wear.
Methodology and research methods. The domestic and foreign studies of non-exhaust origin particulate matter emissions of wheeled vehicles were analyzed during the work with the help of systematic analysis method, as well as the analysis of regulatory legal acts in this area was made.
Scientific novelty and results. The article summarizes the recent studies results of environmental emissions of non-exhaust origin produced by wheeled vehicles and raises problematic issues to create a methodology for estimating particulate emissions caused by tire and road wear.
Practical signifi cance. The article identifies problematic issues in the study of non-exhaust emissions origin, the solution of which will help to determine the main directions for reducing emissions of particulate matter from tire and road wear made in the wheeled vehicles operation.